just the std 3.0 vulcan. its a good match for the chassis, ive gotton as high as 28 mpg highway with it before. gets about 23-25 around town, not towed much with it. from what ive heard about the AXOD auto's they do good staying togther just moving the car, dont want to blow up the trans when ive got a ranger i can tow with, the taurus is just my backup plan should the trailer need moved and the ranger is down. this car was a really good deal, got it in '03 with only 26,000 oringinal miles on it, belonged to the grandmother of my sisters husband. its got 116,000 on it now. i only paid $2,500 for it. could have doubled my $ the day i brought it home but i chose to keep it. its had its moments but overall has been a good vehicle.